I was asked to do 360' panorama for "C.A.T.S" mobile game, (c) Zeptolab UK Ltd. 
It was challenging task, click on the video below to see the result.
"C.A.T.S." logo by Alexey Atomskiy. 
I started from sketching all views (front, back, left, right, up, down) in lineart
Continue working on volumes in greayscale. 
And then coloring the sketch. 
After that I cleaned up sketch and done final art. Then collected all views in cubemap using Unity for testing and minor tweaks on textures. 
Hope you like it, thanks for viewing!